To test the wavelength tracking ability of the LaserWave-II a 1552 nm DFB laser diode was heated slightly and then the wavelength measured at 30 second intervals as the laser diode returned to room temperature. The laser current was kept constant, but no active temperature control was used. The data was transferred to Excel and the peak centroid plotted in spreadsheet format (Figure 1A).

The laser was then allowed to remain at room temperature (without active stabilization) for 30 minutes and the wavelength again measured at 30 second intervals. (Figure 1B) Within the LW-II a resolution of 0.01 nm no change in wavelength was found. The spectrum of the laser at the end of this test is shown in Figure 2.